48" CX reviewed as a TV,
48" CX reviewed as a Monitor,
I have 2839 hours on my CX, used only as a desktop monitor. No burn-in. Haven’t done anything to avoid burn-in, other than run a black desktop background.
EDIT: I see that you’re using a 3080, I have a 3090. You’ll be able to set your desktop to 120hz @ 32bit RGB 10bpc with Full dynamic range, because those cards have HDMI 2.1